//
//
//
#ifndef _Echop_
#define _Echop_

#include "dsdmobse.h"
#include "dmocom.h"
#include "dsdmo.h"
#include "PropertyHelp.h"
#include "param.h"

#define cALLPASS		((float).61803398875)	// 1-x^2=x.
#define RVB_LP_COEF		((float).1)
#define MAXALLPASS		cALLPASS

class CDirectSoundEchoDMO : 
    public CDirectSoundDMO, 
    public CParamsManager,
    public ISpecifyPropertyPages,
    public IDirectSoundFXEcho,
    public CParamsManager::UpdateCallback,
    public CComBase
{
public:
    CDirectSoundEchoDMO( IUnknown *pUnk, HRESULT *phr );
    ~CDirectSoundEchoDMO();

    DECLARE_IUNKNOWN;
    STDMETHODIMP NDQueryInterface(REFIID riid, void **ppv);
    static CComBase* WINAPI CreateInstance(IUnknown *pUnk, HRESULT *phr);

    // InitOnCreation is called by the class factory to give the object a chance to initialize
    // immediately after it is created.  This is used to prepare the object's parameter information.
    HRESULT InitOnCreation();

    // Note that an Init function also exists in the CPCMDMO base class and it can be overridden
    // to provide initialization for the effect's actual audio processing.

    STDMETHOD(Clone)                (THIS_ IMediaObjectInPlace **);
    
	HRESULT Init();

    /* IFilter */
    STDMETHOD(SetAllParameters)             (THIS_ LPCDSFXEcho);
    STDMETHOD(GetAllParameters)             (THIS_ LPDSFXEcho);
    
    // ISpecifyPropertyPages
    STDMETHOD(GetPages)(CAUUID * pPages) { return PropertyHelp::GetPages(CLSID_DirectSoundPropEcho, pPages); }

    // IPersist methods
    virtual HRESULT STDMETHODCALLTYPE GetClassID( CLSID *pClassID );

    // IPersistStream
    STDMETHOD(IsDirty)(void) { return m_fDirty ? S_OK : S_FALSE; }
    STDMETHOD(Load)(IStream *pStm) { return PropertyHelp::Load(this, DSFXEcho(), pStm); }
    STDMETHOD(Save)(IStream *pStm, BOOL fClearDirty) { return PropertyHelp::Save(this, DSFXEcho(), pStm, fClearDirty); }
    STDMETHOD(GetSizeMax)(ULARGE_INTEGER *pcbSize) { if (!pcbSize) return E_POINTER; pcbSize->QuadPart = sizeof(DSFXEcho); return S_OK; }

    // SetParam handling
    STDMETHODIMP SetParam(DWORD dwParamIndex,MP_DATA value) { return SetParamInternal(dwParamIndex, value, false); }
    HRESULT SetParamUpdate(DWORD dwParamIndex, MP_DATA value) { return SetParamInternal(dwParamIndex, value, true); }
    HRESULT SetParamInternal(DWORD dwParamIndex, MP_DATA value, bool fSkipPasssingToParamManager);

    // Overrides
    //
    HRESULT FBRProcess(DWORD cQuanta, BYTE *pIn, BYTE *pOut);
    HRESULT ProcessInPlace(ULONG ulQuanta, LPBYTE pcbData, REFERENCE_TIME rtStart, DWORD dwFlags);
    HRESULT Discontinuity();
    
    bool m_fDirty;

protected:
	HRESULT CheckInputType(const DMO_MEDIA_TYPE *pmt) {
		HRESULT hr = CPCMDMO::CheckInputType(pmt);
		if (FAILED(hr)) return hr;

		WAVEFORMATEX *pWave = (WAVEFORMATEX*)pmt->pbFormat;
		if (pWave->wFormatTag      != WAVE_FORMAT_PCM ||
			(pWave->wBitsPerSample != 8 && pWave->wBitsPerSample != 16) ||
			(pWave->nChannels      != 1 && pWave->nChannels != 2)) {
			return DMO_E_TYPE_NOT_ACCEPTED;
		}

		return S_OK;
   	}

private:
// { EAX
	__forceinline void DoOneSample(int *l, int *r);

// Declare internal variables.

#define DECLARE_EAX_VARS(type, var) \
	type m_Eax ## var;

	DECLARE_EAX_VARS(long, DelayLRead);
	DECLARE_EAX_VARS(long, DelayRRead);


#define m_EaxSamplesPerSec m_ulSamplingRate

	__forceinline int Saturate(float f) {
								int i;
#ifdef DONTUSEi386
								_asm {
									fld f
									fistp i
								}
#else
								i = (int)f;
#endif 
								if (i > 32767)
									i =  32767;
								else if ( i < -32768)
									i = -32768;
								return(i);
							}


	float		m_StateL, m_StateR;

	__forceinline float Interpolate(float a, float b, float percent)
	{
		percent = a + (b - a) * percent;

		return(percent);
	}


	DECLARE_EAX_VARS(float, Lpfb);
	DECLARE_EAX_VARS(float, Lpff);
	DECLARE_EAX_VARS(float, Wetlevel);
	DECLARE_EAX_VARS(long,  Pan);

	void Bump(void);

	DelayBuffer2<float, 2000, 16> m_DelayL;
	DelayBuffer2<float, 2000, 16> m_DelayR;

// } EAX
};

EXT_STD_CREATE(Echo);

#endif//